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to layout (such as centering, padding, rows, and columns).
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the inspector helps you visualize and explore flutter widget
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trees, and can be used for the following:
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<topic_end>
|
<topic_start>
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get started
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to debug a layout issue, run the app in debug mode and
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open the inspector by clicking the flutter inspector
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tab on the DevTools toolbar.
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info note
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you can still access the flutter inspector directly from
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android Studio/IntelliJ, but you might prefer the
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more spacious view when running it from DevTools
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in a browser.
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<topic_end>
|
<topic_start>
|
debugging layout issues visually
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the following is a guide to the features available in the
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inspector’s toolbar. when space is limited, the icon is
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used as the visual version of the label.
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enable this button in order to select
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a widget on the device to inspect it. for more information,
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see inspecting a widget.
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<topic_end>
|
<topic_start>
|
inspecting a widget
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you can browse the interactive widget tree to view nearby
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widgets and see their field values.
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to locate individual UI elements in the widget tree,
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click the select widget mode button in the toolbar.
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this puts the app on the device into a “widget select” mode.
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click any widget in the app’s UI; this selects the widget on the
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app’s screen, and scrolls the widget tree to the corresponding node.
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toggle the select widget mode button again to exit
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widget select mode.
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when debugging layout issues, the key fields to look at are the
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size and constraints fields. the constraints flow down the tree,
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and the sizes flow back up. for more information on how this works,
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see understanding constraints.
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<topic_end>
|
<topic_start>
|
flutter layout explorer
|
the flutter layout explorer helps you to better understand
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flutter layouts.
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for an overview of what you can do with this tool, see
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the flutter explorer video:
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you might also find the following step-by-step article useful:
|
<topic_end>
|
<topic_start>
|
using the layout explorer
|
from the flutter inspector, select a widget. the layout explorer
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supports both flex layouts and fixed size layouts, and has
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specific tooling for both kinds.
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<topic_end>
|
<topic_start>
|
flex layouts
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when you select a flex widget (for example, row, column, flex)
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or a direct child of a flex widget, the flex layout tool will
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appear in the layout explorer.
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the layout explorer visualizes how flex widgets and their
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children are laid out. the explorer identifies the main axis
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and cross axis, as well as the current alignment for each
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(for example, start, end, and spaceBetween).
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it also shows details like flex factor, flex fit, and layout
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constraints.
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additionally, the explorer shows layout constraint violations
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and render overflow errors. violated layout constraints
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are colored red, and overflow errors are presented in the
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standard “yellow-tape” pattern, as you might see on a running
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device. these visualizations aim to improve understanding of
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why overflow errors occur as well as how to fix them.
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clicking a widget in the layout explorer mirrors
|
the selection on the on-device inspector. select widget mode
|
needs to be enabled for this. to enable it,
|
click on the select widget mode button in the inspector.
|
for some properties, like flex factor, flex fit, and alignment,
|
you can modify the value via dropdown lists in the explorer.
|
when modifying a widget property, you see the new value reflected
|
not only in the layout explorer, but also on the
|
device running your flutter app. the explorer animates
|
on property changes so that the effect of the change is clear.
|
widget property changes made from the layout explorer don’t
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modify your source code and are reverted on hot reload.
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<topic_end>
|
<topic_start>
|
interactive properties
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layout explorer supports modifying mainAxisAlignment,
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crossAxisAlignment, and FlexParentData.flex.
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in the future, we may add support for additional properties
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such as mainAxisSize, textDirection, and
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FlexParentData.fit.
|
<topic_end>
|
<topic_start>
|
mainAxisAlignment
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supported values:
|
<topic_end>
|
<topic_start>
|
crossAxisAlignment
|
supported values:
|
<topic_end>
|
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